Multiple indicator for crane boom



May 2, 1964 M. J. LESATZ 3,13 ,6 7

MULTIPLE INDICATOR FOR CRANE BOOM Filed April 9, 1963 2 Sheets-Sheet l35 3/ A4 AZ :4 34

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ZAP! us 70 To LOAD FOOT 500 M H emu? MALI-0A0 L IE1 INVENTORQV Marv-HEWd. 455/972 May 12, 1964 M. J. LESATZ MULTIPLE INDICATOR FOR CRANE BOOM 2Sheets-Sheet 2 Filed April 9, 1963 Izool INVENTOR. MHTTHEW J 55472ATTOEA/EY United States Patent 3,132,627 MULTIPLE INDICATOR FOR CRANEBOOM Matthew J. Lesatz, 617 S. 69th St., Milwaukee, Wis. Filed Apr. 9,1963, Ser. No. 271,686 1 Claim. (Cl. 116-124) This invention relates toimprovements in crane boom indicators, and more particularly to a novelmultiple indicator for crane booms.

An object of the invention is to provide a device of the type which willsimultaneously indicate the maximum allowable load in tons at all boomangles, the operating radius in feet of the boom at all angles, and theheight of the boom in feet at all boom angles.

Another object of the invention is to provide an indicator within theoperators cab mounted and operable horizontally immediately in front ofhim in a convenient reading position.

Other and further objects of the invention will appear as thedescription proceeds, reference being had to the accompanying drawing,in which:

FIG. 1 is a front view in elevation and partly in section of anindicator dial and operating means embodying the invention.

FIG. 2 is a vertical sectional view of the indicator mechanism taken online 22 of FIG. 1.

FIG. 3 is a fragmentary view of the crane cab showing the novel cablemounting.

FIG. 4 is a fragmentary vertical sectional view of the crane cab showingthe position of the indicator dial and the indicator cable mounting.

FIG. 5 is a detail view similar to FIG. 3.

FIG. 6 is a view taken on line 6-6 of FIG. 5.

FIG. 7 is a front view in elevation of a modified form of indicator anddial assembly.

FIG. 8 is a view taken on line 8-8 of FIG. 7.

FIG. 9 is a broken plan view of the boom length numeral indicatingelement.

Referring more particularly to the drawings, the numeral 10 refers tothe operators cab of a crane 11, with a plane dial 12 disposed justbeneath the front window 13 in convenient position for reference by theoperator. The dial 12 has at the top a row of figures relating to theboom angle in degrees. Immediately thereunder is a series of numeralsindicating the radius to load in degrees. Thereunder, also horizontallydisposed is a series of figures indicating the boom height. The bottomrow of figures indicates the maximum load in tons. At the extreme rightof the dial chart is the notation 70 foot boom" which is the boom lengthto which the figures on the dial are correlated.

3,132,627. Patented May 12, 1964 A pointer 14 is affixed to block 15which travels freely longitudinally in the channel 16. The block 15 isengaged with a cord 17 which runs over the pulley 18 to a terminal at 19of casing 20, over a second pulley 21 held by link 22 in engagement witha coil spring 23. The opposite end of the block 15 is coupled with acord 24 which runs over pulley 25 thence downwardly and around pulley 26and upwardly and in an are over a series of pulleys 27 rotatably fixedon the quadrant 28 to its terminal on the bracket 29 on boom 30.

Dial 12 is topped by a pair of adjustable pointers 31 and 32 which arecarried in channel segments 33 and 34 and may be fixed in desiredlocations longitudinally of the dial by means of the setscrews 35 and36.

In FIG. 7 a modified form of dial assembly 40 is illustrated in which anelongated chart graduated to relate to a plurality of boom lengths iskept wound by the ends on the spools or spindles 42 and 43. An apertureat 44 of the casing 45 exposes a numeral relating to the boom length towhich the figures exposed at the time on the dial pertain.

In use, the operator may adjust the pointers 31 and 32 to the positionsof load and discharge, so as to facilitate rapid and safe handling ofthe work.

It will be understood that the device is capable of many modificationsin structure and design, without departing from the spirit of theinvention within the scope of the appended claim.

Having thus described the invention, what is claimed and desired to besecured by Letters Patent of the United States Patent Oflice, is:

A multiple indicator for a crane boom, an elongated tape, a pair ofspindles on which said tape is wound, four columns of figures eachhorizontally aligned on said tape, said tape divided into figurepatterns for special separate lengths of booms, manual means for movingsaid tape appropriate to the length of boom employed, an indicatormovable over said tape, cord means connecting said indicator with theboom and with a spring for return movement thereof, and a pair ofsettable indicators to mark loading and discharge angles of the boom.

References Cited in the file of this patent UNITED STATES PATENTS1,663,983 Hapgood Mar. 27, 1928 1,989,490 Millen Jan. 29, 1935 2,022,844Christian Dec. 3, 1935 2,374,298 Nasset Apr. 24, 1945 2,418,593 Martinet a1. Apr. 8, 1947 2,941,496 Leischer June 21, 1960 3,012,537 ThielDec. 12, 1961

